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Finding the Fourth Proportional to 305,788.80, 458,683.20 and 128,423.10

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Solution

The fourth proportional to 305,788.80, 458,683.20 and 128,423.10 is: 192,634.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,788.80 : 458,683.20 = 128,423.10 : x
  2. Step 2: Convert to fraction form
    305,788.80/458,683.20 = 128,423.10/x
  3. Step 3: Cross multiply
    305,788.80x = 458,683.20 × 128,423.10
  4. Step 4: Simplify right side
    305,788.80x = 58,905,518,461.92
  5. Step 5: Solve for x
    x = 58,905,518,461.92/305,788.80
  6. Step 6: Final answer
    x = 192,634.65

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.